What does the message "Please keep this information" mean?

Spam messages. This kind of information can confuse users if it is not black or blocked.

The first is to use the black screen function of the mobile phone to prevent the designated harassing calls from dialing in.

The second way is to download and install a mobile phone security software for all-round protection.

I am using Tencent mobile phone housekeeper, and I only know it better.

Open Tencent Mobile Manager-Security Protection-Harassment Interception-Click "Interception" in the upper right corner-Add Blacklist-Done.

So as to block harassing calls,

Moreover, Tencent mobile phone housekeeper can intercept harassing calls that ring only once.

This is why I recommend Tencent mobile phone housekeeper.

I hope my answer can help you. Please keep asking questions.